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Securities Held-To-Maturity - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
bond
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Held-to-Maturity Securities [Line Items]          
Held-to-maturity securities, face value $ 230,190   $ 230,190   $ 230,495
Interest income, including the amortization of discount 3,000 $ 3,600 11,300 $ 10,700  
APL certificates          
Schedule of Held-to-Maturity Securities [Line Items]          
Held-to-maturity securities, face value 192,791   192,791   $ 192,791
Amount purchased at a discount $ 119,000   $ 119,000    
Weighted average variable interest rate (as a percent) 3.94%   3.94%    
Estimated weighted average remaining maturity period     6 years 7 months 6 days    
Weighted average fixed interest rate     8.84%   8.85%
After one year through five years $ 192,800   $ 192,800    
APL certificates | Minimum          
Schedule of Held-to-Maturity Securities [Line Items]          
Securities maturity term     5 years    
APL certificates | Maximum          
Schedule of Held-to-Maturity Securities [Line Items]          
Securities maturity term     10 years    
Seven B Piece Bonds          
Schedule of Held-to-Maturity Securities [Line Items]          
Estimated weighted average remaining maturity period     13 years 4 months 24 days    
Bonds retained percentage     49.00%    
Initial face value of bonds purchased     $ 106,200    
Number of B Piece bonds | bond     7    
Discounted value of bonds purchased     $ 74,700    
Held-to-maturity securities sold, percentage 51.00%   51.00%    
Agency B Piece Bonds          
Schedule of Held-to-Maturity Securities [Line Items]          
Weighted average variable interest rate (as a percent) 3.74%   3.74%   11.28%
Weighted average effective interest rate (as a percent) 11.59%   11.59%    
Within one year $ 37,400   $ 37,400